Speaker
Philipp Mertsch
(KIPAC, Stanford)
Description
The anomaly in the cosmic ray positron fraction, first observed by the PAMELA experiment and later confirmed by Fermi-LAT and AMS-02, has generated a lot of interest and theoretical efforts, mostly due to the suggested interpretation as an indirect signature of dark matter annihilation in the Galaxy. I will argue that this interpretation is now strongly disfavoured by searches for gamma-rays from the galactic halo and turn to possible astrophysical explanations. A hadronic model of production and acceleration of secondaries in mature supernova remnants provides a compelling explanation of hard secondary positrons and links to signatures in other hadronic channels, like neutrinos.
Primary author
Philipp Mertsch
(KIPAC, Stanford)
Co-authors
Markus Ahlers
(o=uwmad,ou=Institutions,dc=icecube,dc=wisc,dc=edu)
Prof.
Subir Sarkar Sarkar
(University of Oxford)
